CN112680205B - Surfactant oil displacement system and preparation method thereof - Google Patents
Surfactant oil displacement system and preparation method thereof Download PDFInfo
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- CN112680205B CN112680205B CN201910986886.4A CN201910986886A CN112680205B CN 112680205 B CN112680205 B CN 112680205B CN 201910986886 A CN201910986886 A CN 201910986886A CN 112680205 B CN112680205 B CN 112680205B
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Abstract
The invention discloses a surfactant oil displacement system and a preparation method thereof. The surfactant flooding system comprises: a surfactant, an organosilicon compound and a silane coupling agent; the content of the organic silicon compound is 0.05 to 10 percent by taking the weight of the surfactant as 100 percent; the content of the silane coupling agent is 0.01-5%. The preparation method comprises the following steps: and adding the organosilicon compound and the silane coupling agent into the surfactant according to the dosage to prepare the surfactant oil-displacing system. The invention can reduce the adsorption of the surfactant on the stratum, thereby improving the oil displacement effect and the economic benefit.
Description
Technical Field
The invention relates to the technical field of oil extraction and displacement of oil in an oil field, in particular to a surfactant oil displacement system and a preparation method thereof.
Background
Petroleum is an important natural resource and a national strategic material. With the development of socio-economic, the demand for petroleum is increasing. In order to improve the recovery ratio of crude oil, people develop various oil displacement technologies, wherein an oil displacement system with surfactant is an important technical means, and the invention and the application of the technology greatly improve the recovery ratio of the crude oil in an oil field and increase the economic benefit.
At the same time, one of the most difficult problems to be solved in the oil displacement system with the surfactant involved is the great loss of the surfactant in an oil reservoir in the displacement process. There are a variety of physico-chemical mechanisms that cause retention loss of surfactant in the formation, the most important of which is the adsorption of surfactant at solid interfaces, the level of surfactant adsorption on formation rock being one of the major factors that directly impact the economic viability of surfactant flooding. Adsorption can result in excessive loss of surfactant in the slug, reducing the oil displacement effect, and selective adsorption of various components in the surfactant can also cause chromatographic separation of the surfactant.
How to reduce the adsorption of the surfactant on a solid interface and improve the oil displacement effect is a technical problem to be solved urgently at present.
Disclosure of Invention
The invention provides a surfactant oil displacement system and a preparation method thereof, aiming at solving the problems that the surfactant oil displacement system in the prior art has large adsorption loss on stratum and influences the oil displacement efficiency. According to the invention, the organic silicon micromolecules and the silane coupling agent are adopted to act together, and the surfactant oil displacement system is injected into the stratum along with the surfactant oil displacement system, so that the surface of the stratum is modified in situ under the conditions of the temperature and the pH value of the stratum, and the adsorption of the surfactant on the stratum is reduced, thus the oil displacement effect is improved, and the economic benefit is improved. The technology has the outstanding advantages of simple selected formula, less chemical agent consumption, simple application condition, low construction cost, no change of the original injection technical parameters of the surfactant oil displacement system, no influence on the stability of the surfactant system, effective control of the process cost and improvement of the economic benefit.
It is an object of the present invention to provide a surfactant flooding system.
The surfactant flooding system comprises: a surfactant, an organosilicon compound and a silane coupling agent;
based on the weight of the surfactant as 100 percent,
the content of the organic silicon compound is 0.05 to 10 percent; preferably 0.5 to 8 percent;
the content of the silane coupling agent is 0.01-5%; preferably 0.25 to 4 percent;
wherein the content of the first and second substances,
the organic silicon compound is one or a combination of hydroxyl silicone oil, hydrogen-containing silicone oil, hydroxyl fluorine-containing polysiloxane, fluorine-containing alkyl trialkoxysilane and alkyl trialkoxysilane.
The content of hydroxyl in the hydroxyl silicone oil is preferably 0.5 to 5 percent.
The hydrogen content in the hydrogen-containing silicone oil is preferably 0.1-3%.
The alkoxy in the fluorine-containing alkyl trialkoxysilane is preferably selected from methoxy or ethoxy,
the alkoxy group in the alkyl trialkoxysilane is preferably selected from a methoxy group or an ethoxy group.
The silane coupling agent is one or a combination of aminoethyl methyldimethoxysilane, aminopropyltrimethoxysilane, aminopropyltriethoxysilane, aminoethyl aminopropylmethyldimethoxysilane and aminopropylmethyldimethoxysilane.
The surfactant may be any surfactant or surfactant system suitable for use in the art, such as petroleum sulfonate surfactant, polyether carboxylate surfactant, betaine surfactant, anionic surfactant system such as sodium hexadecylbenzene sulfonate, cationic surfactant system such as dodecyl trimethyl ammonium chloride, hexadecyl trimethyl ammonium bromide, nonionic surfactant system such as cocamide, polyether polyol, nonylphenol polyoxyethylene ether, and combinations thereof.
The second objective of the present invention is to provide a method for preparing a surfactant oil-displacing system.
The method comprises the following steps:
and adding the organosilicon compound and the silane coupling agent into the surfactant according to the dosage to prepare the surfactant oil-displacing system.
In particular, the amount of the solvent to be used,
the organic silicon compound and the silane coupling agent can be directly added into the existing surfactant system and simultaneously injected into the stratum for oil displacement.
The invention has the following effects:
according to the invention, the organic silicon micromolecules and the silane coupling agent are adopted to act together, and the surfactant oil displacement system is injected into the stratum along with the surfactant oil displacement system, so that the surface of the stratum is modified in situ under the conditions of the temperature and the pH value of the stratum, and the adsorption of the surfactant on the stratum is reduced, thus the oil displacement effect is improved, and the economic benefit is improved. The technology has the outstanding advantages of simple selected formula, less chemical agent dosage, simple application condition, no change of the original injection technical parameters of the surfactant oil displacement system, no influence on the stability of the surfactant system, effective control of process cost and improvement of economic benefit.
By adopting the technical scheme of the invention, the adsorption loss of the surfactant in the displacement process is reduced by more than 50%, and a better technical effect is achieved.
Detailed Description
While the present invention will be described in detail with reference to the following examples, it should be understood that the following examples are illustrative of the present invention and are not to be construed as limiting the scope of the present invention.
The starting materials used in the examples are all commercially available products.
Example 1
1kg of petroleum sodium sulfonate 0.3%, 0.05% by weight of HPAM, 0.1% 2 CO 3 And adding 50g of methyl triethoxysilane and 5g of aminopropyl methyl dimethoxysilane into the solution, and uniformly mixing to prepare a displacement system solution 1a.
Example 2
1kg of a displacement system solution 2a was prepared by adding 30g of methylhydroxysilicone oil (hydroxyl group content 1.5%) and 4g of aminopropyltriethoxysilane to 0.04 wt% of HPAM solution containing 0.1 wt% of propyl betaine oleate and mixing them uniformly.
Example 3
1kg contains 0.2% wt of sodium decaalkylpolyoxyethylene (6) sulfate, 0.1% wt of HPAM, 0.2% wt of Na 2 CO 3 0.5g of methylhydroxy silicone oil (hydroxyl content: 0.8%) and 0.1g of aminopropyltrimethoxysilane were added to the solution and mixed uniformly to prepare a displacement system solution 3a.
Example 4
0.1% by weight of nonylphenol polyoxyethylene ether (4)/SDS (molar ratio of both 1: 2), 0.05% by weight of HPAM, 0.2% by weight of Na 2 CO 3 100g of methylhydroxy silicone oil (hydroxyl content: 2%) and 50g of aminopropyltrimethoxysilane are added to the solution and mixed uniformly to prepare a displacement system solution 4a.
Example 5
1kg contains 0.25% wt of sodium petroleum sulfonate, 0.05% wt of HPAM, 0.1% wt of Na 2 CO 3 50g of fluorine-containing pentyl triethoxy silane and 5g of aminoethyl aminopropyl methyl dimethoxy silane are added into the solution and uniformly mixed to prepare a displacement system solution 5a.
Example 6
1kg0.25% wt SDS/CTAC (molar ratio of both is 8: 1), 0.05% wt HPAM, 0.1% wt Na 2 CO 3 50g of methylhydroxy silicone oil (hydroxyl content: 4%) and 5g of aminoethyl aminopropyl methyl dimethoxy silane were added to the solution and mixed uniformly to prepare a displacement system solution 6a.
Example 7
1kg of a solution containing 0.3% by weight of sodium petroleum sulfonate and 0.2% by weight of HPAM was added with 80g of hydrogen-containing silicone oil (hydrogen content: 0.16%), 6g of aminoethyl aminopropyl methyldimethoxysilane and mixed uniformly to prepare a displacement system solution 7a.
Example 8
1kg contains 0.3% wt of sodium petroleum sulfonate, 0.2% wt of HPAM, 0.5% wt of Na 2 CO 3 40g of hydrogen-containing silicone oil and 6g of aminoethyl-methyldimethoxysilane are added into the solution and mixed uniformly to prepare a displacement system solution 8a.
Example 9
1kg of sodium dodecyl polyoxyethylene ether (5) carboxylate 0.2% 2 CO 3 30g of hydrogen-containing silicone oil (hydrogen content is 0.1 percent) and 5g of aminoethyl-methyldimethoxysilane are added into the solution and mixed evenly to prepare a displacement system solution 9a.
Example 10
1kg of sodium stearyl polyoxyethylene (4) sulfate/sodium petroleum sulfonate (molar ratio of both 2: 1) 0.3%, 0.12% by weight of HPAM, 0.8% by weight of Na 2 CO 3 60g of hydroxyl fluorine-containing polysiloxane and 6g of aminopropyltrimethoxysilane are added into the solution and mixed uniformly to prepare a displacement system solution 10a.
Static adsorption experiment: preparing a mixed system of surfactant displacement system solution and 80-mesh quartz sand according to a liquid-solid ratio of 5. See table 1.
Core displacement experiment: and (3) after the artificial rock core is taken and saturated water is obtained, injecting a surfactant displacement system solution, collecting the displacement produced liquid, and calculating the dynamic adsorption loss of the surfactant in the rock core.
Comparing and counting the adsorption experiment results:
and respectively measuring the static and dynamic adsorption amounts of the 1 a-10 a displacement system solution and the surfactant solution without the adsorption prevention system according to the experimental method, and calculating the reduction ratio of the adsorption amount.
TABLE 1
As can be seen from the data in table 1, the surfactant oil displacement system prepared in the embodiment of the present application can greatly reduce the adsorption amount of the surfactant, and the reduction ratio can reach 90% at most.
The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention will be covered within the protection scope of the present invention.
Claims (8)
1. A surfactant flooding system, characterized in that:
the surfactant flooding system comprises: a surfactant, an organosilicon compound and a silane coupling agent;
based on the weight of the surfactant as 100 percent,
the content of the organic silicon compound is 0.05 to 10 percent;
the content of the silane coupling agent is 0.01 to 5 percent;
the organic silicon compound is one or a combination of hydroxyl silicone oil, hydrogen-containing silicone oil, hydroxyl fluorine-containing polysiloxane, fluorine-containing alkyl trialkoxysilane and alkyl trialkoxysilane;
the silane coupling agent is one or a combination of aminoethyl methyldimethoxysilane, aminopropyltrimethoxysilane, aminopropyltriethoxysilane, aminoethyl aminopropylmethyldimethoxysilane and aminopropylmethyldimethoxysilane.
2. The surfactant flooding system of claim 1, wherein:
the content of the organic silicon compound is 0.5 to 8 percent.
3. The surfactant flooding system of claim 1, wherein:
the content of the silane coupling agent is 0.25 to 4 percent.
4. The surfactant flooding system of claim 1, wherein:
the hydroxyl content in the hydroxyl silicone oil is 0.5-5%.
5. The surfactant flooding system of claim 1, wherein:
the hydrogen content in the hydrogen-containing silicone oil is 0.1-3%.
6. The surfactant flooding system of claim 1, wherein:
the alkoxy in the fluorine-containing alkyl trialkoxysilane is selected from methoxy or ethoxy.
7. The surfactant flooding system of claim 1, wherein:
the alkoxy in the alkyl trialkoxysilane is selected from methoxy or ethoxy.
8. A method of preparing the surfactant flooding system of any one of claims 1 to 7, characterized in that the method comprises:
and adding the organosilicon compound and the silane coupling agent into the surfactant according to the dosage to prepare the surfactant oil-displacing system.
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